JPEG and PNG import problem.

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gar

Senior Member
Location
Ann Arbor, Michigan
Occupation
EE
151224-0858

JPEG and PNG import problem.

This was originally 800 x 480 and 121 kbytes in .jpeg.
As imported it is 467 x 280 and 26.4 kbytes.

TED-1000 1.5 Bytes.jpg
a
TED-1000 1.5 Bytes.jpg

The above was originally 800 x 480 and 43 kbytes in .png.
Now it is 467 x 280 and 26.7 kbytes.

.
 

mgookin

Senior Member
Location
Fort Myers, FL
Test 1 above was done using the "Insert Image" icon on the WYSIWYG toolbar.

Test 2 above was done using the "Attachments" icon on the same toolbar.

On my drive and in both tests, it reports as 600x800 86.6kb but they display differently.

Another process which can be used is photobucket or similar but I've never done that so I can't advise on it.

gar: what are you trying to do?
 

gar

Senior Member
Location
Ann Arbor, Michigan
Occupation
EE
151224-1034 EST

mgookin:

These are photos of the modulated carrier current signal from a TED-1000 system.

I will try attachments.

Using attachment and the .png file:

There are limitations and compression occurs. On preview results do not look good.

.
 

Attachments

  • TED-1000 1.5 Bytes.jpg
    TED-1000 1.5 Bytes.jpg
    26.1 KB · Views: 0

George Stolz

Moderator
Staff member
Location
Windsor, CO NEC: 2017
Occupation
Service Manager
I didn't realize the forum compresses images, in the past the onus was on the user to compress the image using their own means to get under the restriction...?

I'm on my phone at the moment, scared to even attempt anything. image.jpg

Okay, I tried it...
 

George Stolz

Moderator
Staff member
Location
Windsor, CO NEC: 2017
Occupation
Service Manager
The first was using the toolbar, which compressed it yuckily, and he second was using the method below the post window. I'd say the bottom method looks better from here.
 

gar

Senior Member
Location
Ann Arbor, Michigan
Occupation
EE
151224-1724 EST

George:

Both your images are stored as 280 x 280 and are 7561 bytes in size. Something else is causing the difference in the displayed size on the screen.

.
 

Smart $

Esteemed Member
Location
Ohio
Just to throw some proper terminology at you guys...

downsample = reduce picture pixel count (extends to file if saved as such)
resize = display on screen at a different (usually lower) pixel count than the file
compress = reduce file size without reducing picture pixel count
lossy = a compression type that results in loss of picture clarity
lossless = a storage type which does not degrade picture clarity
 

GoldDigger

Moderator
Staff member
Location
Placerville, CA, USA
Occupation
Retired PV System Designer
FWIW, jpg (JPEG) is a lossy compression algorithm for which you can optionally select the amount of loss to get greater compression. PNG, on the other hand is a lossless compression format with generally good compression efficiency.
 
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